1 files changed, 128 insertions, 0 deletions
diff --git a/dom/fetch/FetchConsumer.h b/dom/fetch/FetchConsumer.h
new file mode 100644
index 0000000000..a7509a0ae5
--- /dev/null
+++ b/dom/fetch/FetchConsumer.h
@@ -0,0 +1,128 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_FetchConsumer_h
+#define mozilla_dom_FetchConsumer_h
+
+#include "Fetch.h"
+#include "nsIObserver.h"
+#include "nsWeakReference.h"
+#include "mozilla/dom/MutableBlobStorage.h"
+
+class nsIThread;
+
+namespace mozilla {
+namespace dom {
+
+class Promise;
+
+namespace workers {
+class WorkerPrivate;
+class WorkerHolder;
+}
+
+template <class Derived> class FetchBody;
+
+// FetchBody is not thread-safe but we need to move it around threads.
+// In order to keep it alive all the time, we use a WorkerHolder, if created on
+// workers, plus a this consumer.
+template <class Derived>
+class FetchBodyConsumer final : public nsIObserver
+                              , public nsSupportsWeakReference
+{
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  static already_AddRefed<Promise>
+  Create(nsIGlobalObject* aGlobal,
+         FetchBody<Derived>* aBody,
+         FetchConsumeType aType,
+         ErrorResult& aRv);
+
+  void
+  ReleaseObject();
+
+  void
+  BeginConsumeBodyMainThread();
+
+  void
+  ContinueConsumeBody(nsresult aStatus, uint32_t aLength, uint8_t* aResult);
+
+  void
+  ContinueConsumeBlobBody(BlobImpl* aBlobImpl);
+
+  void
+  ShutDownMainThreadConsuming();
+
+  workers::WorkerPrivate*
+  GetWorkerPrivate() const
+  {
+    return mWorkerPrivate;
+  }
+
+  void
+  NullifyConsumeBodyPump()
+  {
+    mShuttingDown = true;
+    mConsumeBodyPump = nullptr;
+  }
+
+private:
+  FetchBodyConsumer(nsIGlobalObject* aGlobalObject,
+                    workers::WorkerPrivate* aWorkerPrivate,
+                    FetchBody<Derived>* aBody,
+                    nsIInputStream* aBodyStream,
+                    Promise* aPromise,
+                    FetchConsumeType aType);
+
+  ~FetchBodyConsumer();
+
+  void
+  AssertIsOnTargetThread() const;
+
+  bool
+  RegisterWorkerHolder();
+
+  nsCOMPtr<nsIThread> mTargetThread;
+
+#ifdef DEBUG
+  // This is used only to check if the body has been correctly consumed.
+  RefPtr<FetchBody<Derived>> mBody;
+#endif
+
+  nsCOMPtr<nsIInputStream> mBodyStream;
+  MutableBlobStorage::MutableBlobStorageType mBlobStorageType;
+  nsCString mBodyMimeType;
+
+  // Set when consuming the body is attempted on a worker.
+  // Unset when consumption is done/aborted.
+  // This WorkerHolder keeps alive the consumer via a cycle.
+  UniquePtr<workers::WorkerHolder> mWorkerHolder;
+
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+
+  // Always set whenever the FetchBodyConsumer is created on the worker thread.
+  workers::WorkerPrivate* mWorkerPrivate;
+
+  // Touched on the main-thread only.
+  nsCOMPtr<nsIInputStreamPump> mConsumeBodyPump;
+
+  // Only ever set once, always on target thread.
+  FetchConsumeType mConsumeType;
+  RefPtr<Promise> mConsumePromise;
+
+  // touched only on the target thread.
+  bool mBodyConsumed;
+
+  // touched only on the main-thread.
+  bool mShuttingDown;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_FetchConsumer_h